Optical: systems and elements – Signal reflector – 3-corner retroreflective
Reexamination Certificate
2005-11-09
2008-11-04
Phan, James (Department: 2872)
Optical: systems and elements
Signal reflector
3-corner retroreflective
C359S529000, C428S167000
Reexamination Certificate
active
07445347
ABSTRACT:
Both a metallized cube corner retroreflective sheeting having a high measured daytime luminance factor and a method of manufacture thereof are provided. The sheeting is formed from a transparent planar sheet material including on one side a dense array of retroreflective cube corners having height H. The cube corners are canted edge-more-parallel by within about 1.5 degrees of 10n-9 degrees, where n is the index of refraction within the cube corners, and the cube corner faces are metallized by the application of a thin coating of reflective metal. The thickness of the sheet material between the bases of the cube corners and the opposite side of the sheeting is preferably between 1.75 H and 4.00 H. The resulting metallized, retroreflective sheet material may be mounted on a vehicle to increase its nighttime visibility through the ability of the sheet material to efficiently retroreflect a beam of light from a headlight or other source across a broad range of incident and orientation angles. Advantageously, the sheeting also reflects at least about 3.5% of normal and near normal light at angles within 5° of 45° obliquity, advantageously giving it a high measured daytime luminance factor as required by transportation regulations.
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Avery Dennison Corporation
Cole Thomas W.
Phan James
Roberts Mlotkowski Safran & Cole P.C.
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